WO2003001150A1

WO2003001150A1 - Composite sensor for detecting angular velocity and acceleration

Info

Publication number: WO2003001150A1
Application number: PCT/JP2002/006305
Authority: WO
Inventors: Tomohiro Mitani; Shoichi Takeno; Katsuhiko Omoto
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2001-06-25
Filing date: 2002-06-24
Publication date: 2003-01-03
Also published as: DE10296983T5; US7155975B2; DE10296983B4; JP2003004450A; US20040200279A1

Abstract

A composite sensor protected from vibration and external electromagnetic noise and having a high reliability. In a shield case (38), there are arranged a power relay terminal (39), a GND relay terminal (40), an angular velocity relay terminal (41), an X-axis acceleration relay terminal (42), and a Y-axis acceleration relay terminal (43). A power terminal (27) in angular velocity detection means (21) and a power terminal (32) in acceleration detection means (31) are both electrically connected to a power connector terminal (47) in a protection case (45) via a power relay terminal (39) in the shield case (38). A GND terminal (29) in angular velocity detection means (21) and a GND terminal (29) in acceleration detection means (31) are both electrically connected to a GND connector terminal (51) in the protection case (45) via the GND relay terminal (40) in the shield case (38). A circuit substrate (35) is contained in the shield case (38).

Description

Specification

Composite sensor for angular velocity and acceleration detection

The present invention relates to a composite sensor for detecting angular velocity and acceleration. Background art

As a conventional composite sensor for detecting angular velocity and acceleration (hereinafter, referred to as a composite sensor), there has been one described in, for example, Japanese Patent Application Laid-Open No. H10-23964.

FIG. 6 shows a side sectional view of the conventional composite sensor described in the above publication. The configuration is such that a support member 13 fixing the angular velocity detecting means 11 and the acceleration detecting means 12 on the upper surface, and a signal processing circuit (not shown) for processing angular velocity and acceleration detection signals are provided on the upper surface. It consists of a circuit board 14. Further, the metallic shield case 15 houses the angular velocity detecting means 11, the acceleration detecting means 12, and the support member 13 inside. The protective case 16 made of resin has a circuit board 14 and a shield case 15 inside, and has a connector part 17 projecting outward. In addition, the protective case 16 has four connector terminals 18 inside the connector portion 17.

The connector terminal 18 is electrically connected to the angular velocity detecting means 11 and the acceleration detecting means 12 via a lead wire (not shown) and a circuit board 14. The opening of the protective case 16 is closed with a lid 19 made of resin. The operation of the conventional composite sensor configured as described above will be described. Simultaneous angular velocity and acceleration for composite sensors , The angular velocity signal is outputted by the angular velocity detecting means 11 and the acceleration signal is outputted by the acceleration detecting means 12. The angular velocity signal and the acceleration signal are processed by a signal processing circuit (not shown) on the circuit board 14, and input to the other computer via a lead wire (not shown) and a connector terminal 18. It detects angular velocity and acceleration.

The need for such a composite sensor in which the angular velocity detecting means and the acceleration detecting means are integrated in a single housing has been increasing in recent years in the field of automobiles and the like, which are particularly required to be small and light.

Higher precision, reliability, and lower cost are desired.

To address these issues, conventional composite sensors have improved the issues of small size and light weight, protection from external noise, and low cost.

However, there is a demand for further protection from vibration and external electromagnetic noise and cost reduction by reducing the number of assembling steps and members, and it cannot be said that the state is still satisfactory. In order to solve these issues, it is necessary to review from a broad perspective such as the arrangement of each component of the composite sensor, electric wiring, and mechanical strength. Disclosure of the invention

An angular velocity detecting means having a power terminal, a GND terminal and an angular velocity output terminal and detecting angular velocity; an acceleration detecting means having a power terminal, a GND terminal and an acceleration output terminal and detecting acceleration; and an angular velocity in the angular velocity detecting means A circuit board equipped with a processing circuit for processing the angular velocity signal from the output terminal and the acceleration signal from the acceleration output terminal in the acceleration detecting means. A composite sensor having the angular velocity detecting means and the acceleration detecting means on the circuit board is provided.

Further, while accommodating the circuit board therein, a power relay terminal, a GND relay terminal, an angular velocity relay terminal electrically connected to one end of the angular velocity output terminal of the angular velocity detection means and one end of the acceleration detection means, A metal shield case provided with an acceleration relay terminal having one end electrically connected to the acceleration output terminal; and a housing for housing the shield case, a power connector terminal, a GND connector terminal, and an angular velocity relay in the shield case. A protective case provided with an angular velocity connector terminal electrically connected to the other end of the terminal and an acceleration connector terminal electrically connected to the other end of the acceleration relay terminal in the shield case; Both the power supply terminal of the means and the power supply terminal of the acceleration detection means are placed in a shield case. A power connector terminal of the protective case through a power relay terminal, and a GND terminal of the angular velocity detecting means and a GND terminal of the acceleration detecting means are both connected to a GND relay terminal of the shield case. And a composite sensor electrically connected to the GND connector terminal of the protective case via the second connector. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an exploded perspective view of a composite sensor according to an embodiment of the present invention. FIG. 2 is a side sectional view of the composite sensor according to the embodiment of the present invention. FIG. 3 is a perspective view showing a state where the case and the lid are removed from the angular velocity detecting means in the composite sensor according to the embodiment of the present invention. FIG. 4 is a perspective view showing a state where the composite sensor according to the embodiment of the present invention is viewed from the back side.

FIG. 5 is a top view of a power connector terminal in a protective case in the composite sensor according to the embodiment of the present invention.

FIG. 6 is a side sectional view of a conventional composite sensor. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a composite sensor according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the drawings are schematic diagrams, and do not show the positional relationships correctly in dimensions.

In FIG. 1, the angular velocity detecting means 21 is composed of a vibrating body 22 composed of a single crystal quartz plate having different crystal axes and bonded to each other as shown in FIG. 3, and this vibrating body 22. It is composed of a case 23 to be stored and a lid 24 for closing an opening of the case 23. In the angular velocity detecting means 21, a drive electrode 25 is provided on the front and back surfaces of the vibrating body 22, and a detection electrode 26 is provided on the outer and inner surfaces. The case 23 of the angular velocity detecting means 21 accommodates the vibrating body 22 inside and has an opening (not shown) on the upper surface. Further, the power supply terminal 27, the angular velocity output terminal 28 and the GND terminal 29 are provided so that the lid 24 of the angular velocity detecting means 21 penetrates from the upper surface to the lower surface, and the power terminal 27 and the GND terminal 2 are provided. One end of 9 is electrically connected to the drive electrode 25 of the vibrator 22. One end of the angular velocity output terminal 28 of the lid 24 is electrically connected to the detection electrode of the vibrator 22. In FIG. 1, the acceleration detecting means 31 is a capacitance type acceleration. The sensor has a movable electrode plate (not shown) and a fixed electrode plate (not shown) inside. The movable electrode plate (not shown) and the fixed electrode plate (not shown) are electrically connected to one end. The power supply terminal 32, the X-axis acceleration output terminal 33 a, the Y-axis acceleration output terminal 33 b, and the GND terminal 34 that are electrically connected are configured to protrude outward.

The circuit board 35 has the angular velocity detecting means 21 fixed to the lower surface and has a large number of terminal insertion holes 36 extending from the upper surface to the lower surface. The power supply terminals of the angular velocity detecting means 21 are provided in the terminal insertion holes 36. 27 Angular velocity output terminal 28 and GND terminal 29 pass through.

An acceleration detecting means 31 is fixed to the lower surface of the circuit board 35, and a processing circuit 37 composed of electronic components provided with an AGC circuit (not shown) is provided on the upper surface of the circuit board 35. ing.

In this processing circuit 37, the power supply terminal 27 in the angular velocity detection means 21, the angular velocity output terminal 28, the GND terminal 29, and the power supply terminal 32 in the acceleration detection means 31, the X-axis acceleration output terminal 33a, the Y-axis acceleration A metal shield case 38 electrically connected to the output terminal 3 3b and the GND terminal 3 4 has a housing 38 a and a lid for closing the opening 38 b in the housing 38 a. 3 8c. In addition, the circuit board 35, the angular velocity detecting means 21 and the acceleration detecting means 31 are housed inside the shield case 38, and the power relay terminal 39, the GND relay terminal 40, the angular velocity relay terminal 41, X The axis acceleration relay terminal 42 and the Y-axis acceleration relay terminal 43 are provided so as to penetrate from inside to outside. One end of the power supply relay terminal 39 in the shield case 38 is connected to the power supply terminal 27 in the angular velocity detection means 21 and the power supply terminal 32 in the acceleration detection means 31. Electrically connected. One end of the GND relay terminal 40 is electrically connected to the GND terminal 29 of the angular velocity detecting means 21 and the GND terminal 34 of the acceleration detecting means 31.

One end of the angular velocity relay terminal 41 is electrically connected to an angular velocity output terminal 28 of the angular velocity detecting means 21. Further, one end of the X-axis acceleration relay terminal 42 is electrically connected to the X-axis acceleration output terminal 33a of the acceleration detecting means 31. One end of the Y-axis acceleration relay terminal 43 is electrically connected to the Y-axis acceleration output terminal 33 of the acceleration detecting means 31. The lid 38c of the shield case 38 has an elastic projection 44 provided by making a cut in the vertical portion 38d. Due to the elastic projections 44, the lid 38c is brought into close contact with the outer surface of the opening 38b in the shield case 38 while having elasticity, and the storage section 38a is set to the same potential as the lid 38c. . The shield case 38 is composed of a bottomed cylindrical storage section 38a and a lid 38c that closes an opening 38b in the storage section 38a, and the lid 38c has a storage section. Since the elastic projection 44 is provided on the 38a side, a separate member for fixing the lid 38c to the opening 38b of the storage section 38a becomes unnecessary. As a result, the effect that the number of components of the composite sensor can be reduced can be obtained. The bottomed cylindrical resin protective case 45 houses the shield case 38 inside and has a connector part 46 protruding outward from the side surface. Provide one end of power supply connector terminal 47, angular velocity connector terminal 48, X-axis acceleration connector terminal 49, Y-axis acceleration connector terminal 50, and GND connector terminal 51 inside 6 and the other end to protective case 4. 5 buried. In addition, as shown in FIG. 4, the protective case 45 has a through hole 52 extending from the bottom surface to the outer bottom surface, as well as a power connector terminal 47, an angular velocity connector terminal 48, an X-axis acceleration connector terminal 49, and As shown in FIG. 5, a hole 54 is provided at the other end of the Y-axis acceleration connector terminal 50 from the upper surface to the lower surface, and the hole 54 matches the through hole 52 in the protective case 45. Then, as shown in FIG. 2, the other end of the X-axis acceleration relay terminal 42 is inserted through a hole 54 in the X-axis acceleration connector terminal 49 of the protective case 45, and electrically connected by solder 55. I do. Further, the other end of the Y-axis acceleration relay terminal 43 is passed through a hole 54 in the Y-axis acceleration connector terminal 50 and electrically connected by solder 55. Next, the other end of the power supply relay terminal 39 is passed through the hole 54 in the power supply connector terminal 47 and electrically connected with the solder 55. Further, the other end of the GND relay terminal 40 is passed through the hole 54 in the GND connector terminal 51 and electrically connected with the solder 55. The protective cover 56 made of resin closes the opening of the protective case 45. In addition, in addition to the hole 54, it is possible to further provide a hole in each connector terminal from the viewpoint of manufacturing.

Next, an assembling method of the composite sensor for detecting angular velocity and acceleration according to the embodiment of the present invention configured as described above will be described. First, gold is vapor-deposited on the front and back surfaces of a vibrating body 22 made of quartz having a sound or shape prepared in advance to form a driving electrode 25.

Further, gold is deposited on the outer surface and the inner surface of the vibrating body 22 to form the detection electrode 26. Next, the power terminal 27, the angular velocity output terminal 28, and the GND terminal 29 are inserted into the lid 24 so as to project upward and downward from the upper surface to the lower surface. Next, after the vibrating body 22 is housed inside the case 23, the opening of the case 22 is closed by the lid 24 to form the angular velocity detecting means 21. Next, the acceleration detection means 31 prepared in advance is mounted on the lower surface of the circuit board 35.The power supply terminal 32, the X-axis acceleration output terminal 33a, the Y-axis acceleration output terminal 33b and the GND of the acceleration detection means 31 are provided. Secure so that terminal 34 is electrically connected to circuit board 35.

Next, after inserting the power supply terminal 27, the angular velocity output terminal 28, and the GND terminal 29 of the angular velocity detecting means 21 from below into the terminal hole 36 on the circuit board 35, and then soldering I do.

Further, a processing circuit 37 made of an electronic component is fixed on the upper surface of the circuit board 35. Next, in the storage section 38a of the shield case 38, the power supply relay terminal 39, the GND relay terminal 40, the angular velocity relay terminal 41, X Pass through the axis acceleration relay terminal 42 and the Y-axis acceleration relay terminal 43. Next, one end of the power relay terminal 39, the GND relay terminal 40, the angular velocity relay terminal 41, the X-axis acceleration relay terminal 42, and the Y-axis acceleration relay terminal 43 are inserted into the terminal insertion holes 36 in the circuit board 35. The circuit board 35 is housed in the shield case 38 so that it can be inserted.

Next, a notch is formed around the lid 38c made of a thin plate and the sheet is bent to form an elastic projection 44, and then four sides of the lid 38c are bent to form a vertical portion 38d. Next, the opening 38b of the shield case 38 is covered with a cover 38c, and the elastic projection 44 provided on the vertical portion of the cover 38c covers the opening 38b of the shield case 38. 3. Make sure that 8 c is in close contact with elasticity. At this time, the elastic projections 4 formed by the cuts in the vertical part 38 d provided in the lid 38 c Because 4 is used, there is no need to increase the number of parts.

Next, as shown in FIG. 5, a power connector terminal 47, an angular velocity connector terminal 48, an X-axis acceleration connector terminal 49, and a Y-axis acceleration connector terminal 5 provided with holes 54 from the upper surface to the lower surface on the other end side. Attach the 0 and GND connector terminals 51 and support pins (not shown). Next, the molten resin is poured into a mold (not shown), and a power connector terminal 47, an angular velocity connector terminal 48, an X-axis acceleration connector terminal 49, a Y-axis acceleration connector terminal 50, and a GND connector end are provided. The child 51 is embedded in the protective case 45, and through holes 52 are formed on the upper and lower sides of the hole 54. Next, the power supply relay terminal 39, the GND relay terminal 40, the angular velocity relay terminal 41, the X-axis acceleration relay terminal 42, and the Y-axis in the shield case 38 from above the through hole 52 in the protective case 45. The other end of the acceleration relay terminal 43 is passed through, and the shield case 38 is stored in the protective case 45.

Next, as shown in Fig. 4, from the underside of the protective case 45, the power relay terminal 39 is connected to the power connector terminal 47, the angular speed relay terminal 41 is connected to the angular speed connector terminal 48, and the X-axis acceleration connector Solder the X-axis acceleration relay terminal 42 to the terminal 49, the Y-axis acceleration relay terminal 43 to the Y-axis acceleration connector terminal 50, and the GND relay terminal 40 to the GND connector terminal 51. Finally, the opening in the protective case 45 is closed by the protective lid 56.

The operation of the composite sensor according to the embodiment of the present invention configured and assembled as described above will be described.

First, a processing circuit 37 converts an input voltage from an external DC power supply (not shown) into an AC voltage. 7 is applied to the drive electrode 25 of the vibrating body 22 of the angular velocity detecting means 21. Similarly, when the drive electrode 25 is grounded via the GND connector terminal 51, the GND relay terminal 40, and the GND terminal, the vibrating body 22 bends and vibrates. In this state, when the angular velocity detecting means 21 rotates at an angular velocity ω about the central axis in the longitudinal direction of the vibrating body 22, a corioliser of F = 2 mvo is generated in the vibrating body 22.

With this corerica, an output signal consisting of electric charges generated on the detection electrode 26 is converted into an output voltage by the processing circuit 37 on the circuit board 35 via the angular velocity output terminal 28 and the angular velocity relay terminal 41 and the angular velocity Angular velocity is detected by inputting to the computer (not shown) of the other party via the connector terminal 48.

Similarly, 5 V is applied to the movable electrode plate (not shown) and the fixed electrode plate (not shown) of the acceleration detecting means 31 via the power connector terminal 47, the power relay terminal 39 and the power terminal 27. When acceleration is applied in the X-axis direction and the Y-axis direction that are horizontal to the plane of the acceleration detecting means 31 in the state where the voltage is applied, the movable electrode plate (not shown) moves, and the movable electrode plate moves. The capacitance of the capacitor provided between the fixed electrode plate (not shown) and the fixed electrode plate (not shown) changes.

The change in the capacitance is converted into an output voltage inside the acceleration detecting means 31, and the acceleration in the X-axis direction is converted into an X-axis acceleration output terminal 33a, an X-axis acceleration relay terminal 42, and an X-axis acceleration connector terminal. By inputting it to the other computer (not shown) via 49, the acceleration in the X-axis direction is detected.

Similarly, the acceleration in the Y-axis direction is output via the Y-axis acceleration output terminal 33b, the Y-axis acceleration relay terminal 43, and the Y-axis acceleration connector terminal 50. It detects the acceleration in the Y-axis direction by inputting it to the other computer (not shown). And the other computer

(Not shown), the behavior of the vehicle body is analyzed by analyzing the angular velocity, the acceleration in the X-axis direction, and the acceleration in the Y-axis direction applied to the vehicle body. Here, consider the case where a composite sensor is used in an environment where a large amount of electromagnetic waves are present. In the composite sensor according to the embodiment of the present invention, the shield case 38 has a power supply relay terminal 39, a GND relay terminal 40, an angular velocity relay terminal 41, an X-axis acceleration relay terminal 42, and a Y-axis acceleration relay terminal 4. 3 and both the power supply terminal 27 of the angular velocity detection means 21 and the power supply terminal 32 of the acceleration detection means 31 are connected to the protective case 45 via the power supply relay terminal 39 of the shield case 38. It is electrically connected to the power connector terminal 47, and both the GND terminal 29 of the angular velocity detecting means 21 and the GND terminal 29 of the acceleration detecting means 31 are connected via the GND relay terminal 40 of the shield case 38. Since it is electrically connected to the GND connector terminal 51 of the protective case 45, the circuit board 35 is completely contained in the shield case 38. As a result, an external electromagnetic wave is not input to the wiring pattern (not shown) on the circuit board 35, and the effect that the output signal flowing through the wiring pattern (not shown) on the circuit board 35 is stabilized is obtained. can get. This is based on the fact that the circuit board was completely electromagnetically shielded by directly fixing the composite sensor to the circuit board. In the past, the composite sensor was connected to the circuit board via a holding board to ensure strength, so the structure was not necessarily completely shielded. Next, consider the case where strong vibration is applied to the composite sensor.

In the composite sensor according to the embodiment of the present invention, the power supply connector terminal 47, the GND connector terminal 51, the angular velocity connector terminal 48, the X-axis acceleration connector terminal 49, and the Y-axis acceleration connector terminal in the protective case 45 are provided. Holes 54 are provided in 50, and power supply relay terminals 39, GND relay terminals 40, angular velocity relay terminals 41, X-axis acceleration relay terminals 42, and Y-axis Since the speed relay terminals 4 3 were inserted and electrically connected, the power connector evening terminal 47 and the power relay terminal 39, the GND connector terminal 51 and the GND relay terminal 40, the angular speed connector terminal 48 and the angular speed relay terminal 4 1. The X-axis acceleration connector terminal 49 and the X-axis acceleration relay terminal 42 and the Y-axis acceleration connector terminal 50 and the Y-axis acceleration relay terminal 43 are firmly fixed to each other. As a result, the mechanical strength against vibration is ensured, and the effect of providing a composite sensor with improved reliability is obtained. Industrial applicability

As described above, according to the composite sensor of the present invention, it is possible to protect the device from vibrations and external electromagnetic wave noise, thereby improving reliability.

Furthermore, it contributes to cost reduction by reducing the number of parts.

Claims

The scope of the claims

1. An angular velocity detecting means having a power terminal, a GND terminal and an angular velocity output terminal and detecting angular velocity, an acceleration detecting means having a power terminal, a GND terminal and an acceleration output terminal and detecting acceleration, and said angular velocity detection A circuit board provided with a processing circuit for processing an angular velocity signal from an angular velocity output terminal in the means and an acceleration signal from an acceleration output terminal in the acceleration detection means, wherein the circuit board is provided with the angular velocity detection means and the acceleration detection means. The composite sensor for angular velocity and acceleration detection above.

2. Further, while accommodating the circuit board therein, a power relay terminal, a GND relay terminal, an angular velocity relay terminal having one end electrically connected to one end of the angular velocity output terminal of the angular velocity detection means, and A metal shield case provided with an acceleration relay terminal having one end electrically connected to the acceleration output terminal; a housing for accommodating the shield case; a power connector terminal, a GND connector terminal; and an angular velocity relay in the shield case. A protection case provided with an angular velocity connector terminal electrically connected to the other end of the terminal and an acceleration connector terminal electrically connected to the other end of the acceleration relay terminal in the shield case; Place both the power supply terminal and the power supply terminal of the acceleration detection means in a shield case. It is electrically connected to the power connector terminal of the protective case via a power relay terminal, and both the GND terminal of the angular velocity detecting means and the GND terminal of the acceleration detecting means are connected to the GND relay terminal of the shield case. Through the GND connector terminal of the protective case The composite sensor for detecting angular velocity and acceleration according to claim 1, which is electrically connected.

3. The power supply connector terminal, GND connector terminal, angular velocity connector terminal, and acceleration connector terminal in the protective case are provided with holes, and the power supply relay terminal, GND relay terminal, angular velocity relay terminal, and acceleration relay terminal in the shield case are provided in the holes. 3. The composite sensor for detecting angular velocity and acceleration according to claim 2, wherein the composite sensor is inserted and electrically connected.

4. The shield case has a bottomed cylindrical storage part, and a lid for closing an opening in the storage part. The lid has an elastic projection on the storage part side, and the elastic projection is the lid. The angular velocity and acceleration detecting composite sensor according to claim 2 or 3, wherein the housing and the lid are brought into the same potential by elastically adhering the opening to the opening of the housing.

5. The composite sensor for detecting angular velocity and acceleration according to claim 4, wherein the elastic projection is formed by a cut in a vertical portion provided on the lid.